Method for preparing boron carbide material

Patent metadata

Field	Value
Publication number	US-12384725-B2
Application number	US-202217702969-A
Country	US
Kind code	B2
Filing date	Mar 24, 2022
Priority date	Mar 24, 2021
Publication date	Aug 12, 2025
Grant date	Aug 12, 2025

Abstract

A method for preparing a boron carbide material includes: providing raw materials of a boron material, a carbon material and a rare earth oxide, wherein an element molar ratio B:C of the boron material to the carbon material is in a range of 4:1 to 4:7, and the rare earth oxide is in an amount of 5 wt % or less based on a total weight of the raw materials, mixing and milling the raw materials to obtain a mixture, compressing the mixture into a tablet form by a tablet press, and sintering the compressed mixture by a laser, wherein the laser has a laser wavelength of 980 nm, a laser power in a range of 100 to 3000 W, and a laser irradiation time of 3 to 60 s.

First claim

What is claimed is:

1. A method for preparing a boron carbide material, comprising:
providing raw materials of a boron material, a carbon material and a rare earth oxide, wherein an element molar ratio B:C of the boron material to the carbon material is in a range of 4:1 to 4:7, and the rare earth oxide is in an amount of 5 wt % or less based on a total weight of the raw materials,
mixing and milling the raw materials to obtain a mixture,
compressing the mixture into a tablet form by a tablet press, and
sintering the compressed mixture by a laser, wherein the laser has a laser wavelength of 980 nm, a laser power in a range of 100 to 3000 W, and a laser irradiation time of 3 to 60 s.

2. The method according to claim 1 , wherein the rare earth oxide comprises at least one of oxides of lanthanide elements, scandium (Sc) and yttrium (Y).

3. The method according to claim 1 , wherein the boron material comprises at least one of boric acid (H 3 BO 3 ), and boron oxide (B 2 O 3 ).

4. The method according to claim 1 , wherein the carbon material comprises at least one of graphite, sucrose, glucose, and graphene.

5. The method according to claim 1 , wherein the milling is a high-energy ball milling.

6. The method according to claim 5 , wherein a medium for the high-energy ball milling is one or more selected from anhydrous ethanol, acetone and deionized water.

7. The method according to claim 5 , wherein the high-energy ball milling is performed with a ball milling speed in a range of 300 to 400 rpm, and a ball milling time in a range of 8 to 36 h.

8. The method according to claim 1 , wherein the mixture has a particle size in a range of 45 to 150 μm.

9. The method according to claim 1 , wherein before compressing the mixture, the method further comprises:
preparing an adhesive having a mass fraction of 1% with an organic colloidal material as a solute and deionized water as a solvent,
adding the adhesive to the mixture in a mass ratio of 1:1 to obtain a further mixture,
grinding the further mixture for at least 2 h,
perform a granulation to the further mixture, and
sieving the granulated mixture with a sieve mesh in a range of 100 to 325 meshes.

10. The method according to claim 9 , wherein after sieving, the sieved mixture is compressed into the tablet form by the tablet press, and before the sintering, the method further comprises:
removing the adhesive by laser irradiation or heating.

11. The method according to claim 10 , wherein removing the adhesive by heating comprises:
removing the adhesive by heating the compressed mixture to a temperature of 500° C. at a heating rate of 1° C./min, and keeping the temperature for 2 h.

12. The method according to claim 9 , wherein the organic colloidal material comprises at least one of polyvinyl alcohol (PVA), methoxysilane, polyurethane, and silicone.

13. The method according to claim 1 , wherein the sintering is performed in vacuum or an atmosphere of air, nitrogen, oxygen or argon.

14. The method according to claim 1 , wherein the laser is a gas laser, a solid laser, a semiconductor diode laser, a fuel laser, a fiber laser, a free electron laser or a diode pumped solid-state laser.

15. The method according to claim 1 , wherein the laser has a spot size of 7×7 mm.

Assignees

• Yunnan Huapu Quantum Mat Co Ltd
• Roi Optoelectronics Tech Co Ltd
• Chongqing Institute Of East China Normal Univ
• Univ East China Normal

Inventors

• Zeng Heping
• Hu Mengyun
• Qiao Wei

Classifications

• C04B2235/94

  Products characterised by their shape · CPC title

• C04B2235/786

  Micrometer sized grains, i.e. from 1 to 100 micron · CPC title

• C04B2235/3224

  Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide · CPC title

• C04B35/638

  Removal thereof · CPC title

• C04B35/63456

  Polyurethanes; Polyisocyanates · CPC title